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峨眉山玄武岩铜矿与基韦诺超大型铜矿相似,杏仁状玄武岩中的自然铜矿石就是该类型铜矿床中的主要组成部分之一,本文称其为“杏仁体式”自然铜矿床。通过矿石矿物标型特征、矿物组合特征以及固溶体分离结构特征等分析研究,认为川南滇北“杏仁体式”自然铜矿为火山热液矿床,形成于低温还原环境,成矿作用发生在岩浆作用结束期及间歇期热液阶段,成矿经历过热液蚀变改造。铜矿物生成顺序为:自然铜→斑铜矿、辉铜矿、黄铜矿→赤铜矿、黑铜矿、孔雀石等。玄武岩中广泛分布的沥青与自然铜同时形成,并为自然铜及铜的硫化物的形成提供了强还原环境。沥青形成温度和斑铜矿-辉铜矿的固溶体分解温度将自然铜形成温度区间限定为290～225℃。
The Emeishan basaltic copper mine is similar to the Kiwetu super-large copper mine. Natural copper ores in almond basalt are one of the major components of this type of copper deposit, which is referred to as “almond-type” natural copper deposit in this paper. Based on the mineralogical characteristics, the characteristics of mineral assemblages and the structural features of solid solution, it is concluded that the “almond body” natural copper deposit in northern Yunnan is a volcanic hydrothermal deposit formed in the low-temperature reduction environment and the mineralization took place after the magmatism ended Period and intermittent hydrothermal stage, mineralization experienced hydrothermal alteration alteration. Copper mineral formation order: natural copper → bornite copper, chalcopyrite, chalcopyrite → red copper, black copper, malachite and so on. Bases widely distributed in basalt are formed simultaneously with natural copper and provide a strong reduction environment for the formation of natural copper and copper sulphides. Asphalt formation temperature and the decomposition temperature of the doxorubicin-chalcocite solution limit the natural copper formation temperature to 290-225 ° C.